Update README.md

Author: dimerr

README.md

@@ -13,13 +13,21 @@ It's highly **recommended** to upgrade to latest available stock firmware before
 
 ### Device ID's:
 
+Use vendor-specific software (DeviceManager, [IPCam_DMS](https://team.openipc.org/ipcam_dms/)) or web (Device Config->Info->Version) 
+
+to find out "**System version**"
+
+For example:
+
+V5.00.R02.**000559A7**.10010.040400.0020000
+
 #### Hi3516EV200 + IMX307/SC2315E
-* [559A7](https://github.com/OpenIPC/coupler/releases/download/latest/000559A7_OpenIPC_HI3516EV200_50H20AI_S38_2021-06-20.bin)
-* [559B0](https://github.com/OpenIPC/coupler/releases/download/latest/000559B0_OpenIPC_HI3516EV200_85H30AI_S38_2021-06-20.bin)
-* [559CD](https://github.com/OpenIPC/coupler/releases/download/latest/000559CD_OpenIPC_HI3516EV200_85HF30T_S38_2021-06-20.bin)
+* [000559A7](https://github.com/OpenIPC/coupler/releases/download/latest/000559A7_OpenIPC_HI3516EV200_50H20AI_S38_2021-06-20.bin)
+* [000559B0](https://github.com/OpenIPC/coupler/releases/download/latest/000559B0_OpenIPC_HI3516EV200_85H30AI_S38_2021-06-20.bin)
+* [000559CD](https://github.com/OpenIPC/coupler/releases/download/latest/000559CD_OpenIPC_HI3516EV200_85HF30T_S38_2021-06-20.bin)
 
 #### Hi3516EV300 + IMX335
-* [529B2](https://github.com/OpenIPC/coupler/releases/download/latest/000529B2_OpenIPC_HI3516EV300_85H50AI_2021-06-20.bin)
+* [000529B2](https://github.com/OpenIPC/coupler/releases/download/latest/000529B2_OpenIPC_HI3516EV300_85H50AI_2021-06-20.bin)
 
 ### Flashing
 Use vendor-specific software (DeviceManager, [IPCam_DMS](https://team.openipc.org/ipcam_dms/)) or flash file via web